Comforter in Josh Powell's Storage Unit Tests Positive for Blood
02/10/2012 AT 07:00 PM EST
At the time of his death, Powell was considered a person of interest in the 2009 disappearance and presumed death of his wife Susan when they resided in Utah. Authorities now say his father, jailed on child pornography charges, is also a person of interest.
The gray-blue comforter was seized from a Sumner, Wash., unit on Tuesday, two days after Powell, 36, blew up his Tacoma, Wash.,-area house with him and his sons Charlie, 7, and Braden, 5, inside.
A presumptive test conducted in the field came up positive for blood, and additional testing in the lab will be conducted, the Associated Press reports.
"Field tests are not infallible," says Pierce County, Wash., Prosecutor Mark Linquist, according to AP.